Crommie, M. F., Lutz, C. P., & Eigler, D. M. (1993). Confinement of electrons to quantum corrals on a metal surface. Science262(5131), 218-220.

http://users.phys.psu.edu/~rick/MATH/LECTURES/LECT13/PDF/eigler_circular_corral.pdf

 

eigenstate of quantum corral